Your Mercury deserves better than cheap aftermarket parts that fail after one season. This genuine BEARING, Roller delivers the reliability your engine was built for.

Manufactured to strict Mercury Marine quality standards, this seal ensures reliable operation across all engine RPM ranges. Part number 21739 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Aftermarket parts might save a few dollars upfront, but genuine Mercury Marine part 21739 saves you money long-term by lasting years instead of months. Factory precision means perfect fit — no modifications, no surprises.

Compatible Mercury Marine Engines

FITS: 13-18HP MARINER, MERCURY (SEA PRO)

• Fits MARINER, MERCURY 13-18HP engines
• Compatible HP: 13HP, 15HP, 18HP
• Model types: SEA PRO
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

13HP Models

• 13HP OUTBOARD (Mariner): 0P134638-0P400999
• 13HP OUTBOARD (Mercury): 0P134638-0P400999

15HP Models

• 15HP MARATHON XD (Mariner): 0P017000-0P325499, 9927000-0P016999
• 15HP OUTBOARD (Mariner): 0G590000-0G760299, 0G760300-1B226999, 0P075166-0P400999, 1B227000-1B727495, 9973100-0P016999
• 15HP OUTBOARD (Mercury): 0G590000-0G760299, 0G760300-1B226999, 0P075166-0P400999, 1B227000-1B727495, 9973100-0P016999
• 15HP SEA PRO (Mercury): 0P017000-0P325499, 9927000-0P016999

18HP Models

• 18HP OUTBOARD (Mercury): 5837437-6416712, 6416713-6443972, 7173723-7207857, 7207858-7209532

Looking for your Mercury engine serial number? Our helpful guide shows you exactly where serial numbers are located on different engines.

Verification & Support

Want to verify compatibility for part 21739? Use our parts finder tool for instant confirmation. Still have questions? No problem – use the contact buttons at the bottom of this page to reach us by text, call, or email

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